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It's a Happy Donkey one, whatever
"HD0104 COFFEE MACHINE PRESSURE CHECK GAUGE" is.probably something like this one, that you bolt onto the bottom of the portafilter
https://www.bluestarcoffee.eu/gaggia-portafilter-pressure-test-gauge-5111-p.asp
hippy
Help! Which pressure gauge for Gaggia Classic? Standard Portafilter.
Don't really want to make one - would ideally just like to bolt one on and test periodically.